Safe State Management for ACP Agents

Implement automatic state cleanup to prevent "request entity too large" (413) errors while protecting active jobs. Use targeted filtering of completed jobs rather than full state resets, and add safety checks to ensure no active buyer/seller jobs are accidentally deleted. This maintains data integrity while keeping payload sizes manageable.

Example codes:

• python: https://github.com/game-by-virtuals/game-python/blob/feat/acp/plugins/acp/tools/reduce_agent_state.py

• node: https://github.com/game-by-virtuals/game-node/blob/feat/acp-plugin/plugins/acpPlugin/tools/reduceAgentState.ts